Just purchased a 1990Pintara U12 auto 2.4 ltr 1st car for my daughter. It has only 125,000 K's on the clock. It runs like new except it stutters when under accelration past approx 2000 rvs. Slow acceleration appears to be ok. It has new plugs, leads, new fuel pump and has been recently tuned and serviced ? Can you please help me ??

Just purchased a 1990Pintara U12 auto 2.4 ltr 1st car for my daughter. It has only 125,000 K's on the clock. It runs like new except it stutters when under accelration past approx 2000 rvs. Slow acceleration appears to be ok. It has new plugs, leads, new fuel pump and has been recently tuned and serviced ? Can you please help me ??